[CentOS-virt] KVM virtual machine and SAN storage with FC
brett.worth at gmail.com
Wed Jul 3 05:40:37 UTC 2013
On 03/07/13 15:22, denis bahati wrote:
> Is there any body got any experience on setting up a virtualized environment in which
> the vm's can access a fiber channel SAN storage connected to host? the host access the
> SAN through its own HBA, but the hba is not recognized inside the virtual machines.
> Please let me know the step to go through this.
How you use this storage depends on whether you plan to do migration from one server to
If you're not going to be migrating then you can just allocate the FC LUN to LVM volume
group and carve off logical volumes for the KVM VMs to use. These can then have
meaningful LVM names in /dev/vg_(VG)/lv_(LV) that can be allocated to the VM. See
If you're planning to migrate between machines then the LVM solution is not going to
work. In that case then you might need to create volumes on you FC controller that will
be seen as individual devices/luns on the host servers. There is a consistent device name
that can be used that appears under /dev/disk/by-id. This will be identical on any host
servers that can see that volume. This can be allocated to the VM and will be consistent
for a migration. Using this method requires careful management and meticulous
documentation of which LUNs have been allocated to which VM. The lun ids are not very
We've also have good results with DRBD for times when you want to be able to migrate
between machines but do not have a SAN. You have to allocate all the storage on each
server but you gain by having a sort of backup.
Finally, I can recommend convirt as a good system manager interface.
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